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  • Predaceous Diving Beetle - (Cybister fimbriolatus)

    Predaceous Diving Beetle - (Cybister fimbriolatus)

    The Predaceous Diving Beetle is a 'tiger' among the underwater larval insect world. Adults don't mind a little time on land either.

    Staff Writer (8/3/2017): Found in or near large ponds and lakes, the Predaceous Diving Beetle is hydrodynamic for a life mostly spent in water. It may look like it only has two front legs, but the other 4 legs are there and underneath it. The back legs are flat and used to propel it forward water. The front legs look like bent 'arms' with feathery hairs on all legs.

    They feed on other aquatic insects and creatures, including small tadpoles. Males use their paddle-like feet to secure the female for mating. Both genders fly very well out of water and are attracted to lights at night. They are most active at night and can be seen moving from one water source to another (puddles, pools, ponds, flooded roads, etc.)

    Larvae hatch underwater and look somewhat like long, tubular naiads (larval dragonflies) or centipedes (minus all but 6 legs). They have what appear to be pincers at the mouth which are likely used to catch and consume aquatic insects. They are ferocious predators and aggressive by nature.

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    Details of the:
    Predaceous Diving Beetle

    Category: Beetle
    Common name: Predaceous Diving Beetle
    Scientific Name: Cybister fimbriolatus

      Kingdom: Animalia
       Phylum: Arthropoda
        Class: Insecta
         Order: Coleoptera
          Family: Dytiscidae
           Genus: Cybister
            Species: fimbriolatus

    Size (Adult, Length): 26mm to 34mm (1.02in to 1.34in)

    Identifying Colors: brown; yellow; black; green

    Additional Descriptors: arms, fins, water, smooth, feathery, flying, aggressive, long, tubular

    North American Reach (Though Not Limited To*): Alabama; Alaska; Arkansas; Colorado; Connecticut; Delaware; Florida; Georgia; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maine; Maryland; Massachusetts; Michigan; Minnesota; Mississippi; Missouri; Nebraska; New Hampshire; New Jersey;New York; North Carolina; Ohio; Oklahoma; Pennsylvania; Rhode Island; South Carolina;Tennessee; Texas; Vermont; Virginia; West Virginia; Wisconsin; Wyoming; Manitoba; New Brunswick; Newfoundland and Labrador; Nova Scotia; Ontario; Prince Edward Island; Quebec

    * Keep in mind that an insect's reach is not limited by lines on a map and therefore may appear in areas/regions/states beyond those listed above.

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